'Animation Nodes' Compared with 'Animation Nodes + Extra Nodes'
In Animation nodes + Extra nodes (AN+EN) - as the name says - there are additional nodes in there. Basically, the AN+EN is AN-fork, and it has extra nodes as well as extended version of some nodes e.g., Simulation Nodes, Falloff Tracer, Particles Output, Modified Vector Noise node, Texture Input, etc. Many of the extra/extended nodes have been merged in AN e.g., Grease Pencil, UV Map, Vertex Color, Custom Attributes, Mesh Points Scatter, etc. However, there are some nodes which may not be possible add in AN.